If you send 500lbs of boards its hard to say what you will get out if refining and to be honest there is a minium of 2,00lbs for refining purposes. We have a very large shredder and if you would like to swing by and have a gander you are more than welcome just let me know when and I can give you a tour. (Mesquite TX) Yur in Colorado so that makes it little difficult we also have a processing facility in Stockton Ca so either locaiton is good for a visit its interesting what we can accomplish when we are processing over 30,000,000 lbs of electronics every month.